WELL ARMED: Pals told police Aaron Greene had his bomb sights set on the Washington Square Arch. Photo:

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The Nazi-loving junkie busted along with his Dalton-grad baby mama for allegedly having bombmaking explosive powder and shotguns in their Greenwich Village apartment told pals he planned to blow up the Washington Square Arch, police said yesterday.

Greene would then set off mini-explosions by hitting the powder with a rock.

“I think you should always take a statement like that seriously,” Police Commissioner Ray Kelly told reporters yesterday about Greene’s alleged threats against the treasured marble arch, erected in 1892.

“Particularly when in that person’s apartment there were manuals that talked about explosives and demolition,” the commissioner said, a reference to terrorist literature allegedly found in the posh West Ninth Street home Greene shared with Morgan Gliedman, 27. “There also was ‘The Terrorists Encyclopedia.’ ”

“There were two shotguns,” Kelly added. “There were high-capacity magazines. I think that gives us pause for thought as to whether or not we should pay attention to the statement about whether or not someone is going to blow up anything.

“He also had a quantity of HTMD in his possession, so yeah, we take that statement seriously,” Kelly said of the seven grams of high-grade hexamethylene triperoxide diamine explosive powder allegedly recovered from the couple’s apartment.

The evidence continues to build against the alleged arch-enemy, who has been held without bail since he and Gliedman — both described as heroin addicted, and the parents of a newborn daughter — were busted at their apartment Dec. 29.

Greene had told investigators that he kept a cache of weapons at the Rockland County home of a pal — a clue that led investigators to the Orangeburg home of Greene’s correction-officer pal, Daniel Whittaker, 33.

Investigators raided that address Wednesday, finding 21 guns, including an Uzi 9mm submachine gun. They also found two stun guns, brass knuckles and a switchblade.

Gliedman went into labor with Greene’s child — whom they named Melody Sunshine, and who was described by sources as healthy and not drug addicted — the day of her arrest.

She remains free on $150,000 bail bond, and is in a court-mandated, 30-day in-patient drug treatment at a facility in the city.

The couple’s next court date is Jan. 29.

The baby is being cared for by Gliedman’s parents.

Her father, Dr. Paul Gliedman, is the head of radiation oncology at Beth Israel Brooklyn. Her mother is Realtor Susyn Schops Gliedman.

“Greene told his girlfriend’s parents that his grandfather was a Nazi during World War II,” one law-enforcement source told The Post.

And Greene liked to sign the bottom of letters with the lightning-bolt symbol commonly associated with Hitler’s SS.

In one missive, he repeatedly used the word “kill” and the phrase “kill them all,” sources said.

The ownership of the guns recovered from Whittaker’s home is still under investigation, authorities said. Whittaker, meanwhile, has additional legal troubles — he is on trial for heroin possession and a bar stabbing, authorities said.

Greene told The Post in an exclusive jailhouse interview from Rikers Island last week that the explosives powder was merely “a very small amount of experimental fireworks.”

Asked about the shotguns, he said, “I’m a sportsman, an outdoorsman. Hunting and fishing.”